When I used to carpool to Schutzhund with my friends, we took 4 intact male GSDs and one smaller dog in my minivan, plus 3 people. All the GSD crates were 36". It was a bit tight for the 95lb GSD but OK for a day of training (about 2.5 hour drive each way). I often carpool to flyball tournaments with my friend and her rear crates are 36" SUV crates (so they are even more narrow than a normal 36") and my adult male, Nikon, rides in one OK. Normally I bring along a 42" especially if it's hot, and I keep him in that between races.